Murphy's actions and words resonated through the hall in message directed toward members of Congress to make what difference they can, not for praise but for country.

"We were sent here to look out for our fellow Americans the same way they look out for one another," said Obama.

The president singled out ordinary Americans doing what they can for each other under extraordinary conditions, including Murphy.

"When a gunman opened fire on a Sikh Temple in Wisconsin, Brian was the first to arrive. He did not consider his own safety, he fought back. He fought back until help arrived. And ordered his fellow officers to protect the safety of the fellow Americans worshiping inside," said Obama. "When ask how he did that, Brian said, that's just the way we are made."